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PostPosted: Mon Aug 19, 2013 11:58 am 
Old School Grand Master
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Joined: Tue Nov 18, 2008 10:49 am
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Location: A veritable floating palace
Has anyone done this? I have a set of drum braked 700c wheels doing nothing (or at least I will do when I replace an axle on one of them). I quite like the idea of a set of nice weather commuting tyres on my mountain bike, with knobblies for offroad fun at the weekend.

Has anyone got a picture?


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PostPosted: Mon Aug 19, 2013 12:20 pm 
Gold Trader / PoTM Winner
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Joined: Mon Aug 08, 2011 2:35 pm
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I am building a bike in my head at the moment which will include a 700c drop bar Zaskar, so very interested in the methods adopted by others already... looking forward to the replies


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PostPosted: Mon Aug 19, 2013 1:02 pm 
Retro Guru
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Joined: Thu Jul 26, 2012 1:31 pm
Posts: 2366
Location: The Cave of Shame
I have a drop bar pace 700c fast commuter currently in build......

The parts list ... mostly from my parts bin.

Orbea CX front fork.
Campy Chorus 10 speed Ergo's
New Success Rear Mech
XT front mech.
Bonty SSC-V compact drops
Ritchey adjustable stem 26cm
Avid BB7 Road version.
Hope 1st gen sealed Headset
Deore/WTB SX24 700c/29er wheelset
Biggest learning experience so far is drop levers mean Canti's, Mini-V's or Road disc brakes although I knew this before starting.
2nd biggest is dont bother with manufacturers cable kits. The standard campy one doesnt have enough length for the disc or the Mech cable routings on the Pace.
3rd biggest is fork clearance - I have a CX fork which has a farily narrow clearance widthwise. So my plans to be able to swap between 26" and 700c wheels only works with a 1.7" or so 26" tyre. I wanted road bike looks otherwise I would have more than likely gone for a set of Pace RC31's as with both disc mount and adjustable V brackets they are very versatile.


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pace.JPG
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PostPosted: Mon Aug 19, 2013 1:46 pm 
retrobike rider
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Joined: Sun Feb 19, 2012 10:08 am
Posts: 6846
Location: Nth Somerset, UK
I built my Rourke mtb frame up with 700c wheels and Mavic brake stud adaptors.

All went well until I fitted CX tyres and at that point I ran out of clearance because of the additional height of the tyres over the road tyres I had done all the mock up work with.

In the end I went back to 26" wheels, but kept the road gearing, drop bars etc. I overcame any braking issues by using FSA SL-K CX canti's, which are designed to work with road brake / shifter levers and are very powerful.

If you are only going to use road tyres you should get away with it.

One additional thing to watch is chain line / front mech. I used a SRAM GXP crankset, but because of the additional width of the chain stays on my mtb, the inner chain ring touched the stay. I changed to a Truvativ triple crankset, with the granny ring removed, but that moved the chain line too far out for the road front mech to work properly, so in the end I have compact road rings on a mtb crankset, a road rear mech and mtb front mech. It all works fine, but it really is a bit Frankenbike.


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PostPosted: Mon Aug 19, 2013 1:50 pm 
Retro Guru
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Joined: Thu Jul 26, 2012 1:31 pm
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One thing I should mention is that there are plenty of 700c men's on the main drop bar mtb thread - well worth a look for research purposes.


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PostPosted: Mon Aug 19, 2013 2:42 pm 
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Joined: Tue Sep 27, 2011 8:47 pm
Posts: 751
Location: France
My STS :

Image

Hopefully Paul still produce V-brakes that alloys to use 700c wheels on Mtb frame..


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PostPosted: Mon Aug 19, 2013 3:49 pm 
Dirt Disciple

Joined: Thu Jul 29, 2010 9:18 am
Posts: 52
Location: West Sussex
Here is my Klein Attitude with 700c - Fixie or SS - cyclo cross tyres - Onza brakes modified with longer bars on the cantilevers to reach the wheel - simple mod !


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PostPosted: Tue Aug 20, 2013 12:35 pm 
Retro Guru
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Joined: Thu Jul 26, 2012 1:31 pm
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Location: The Cave of Shame
NeilM wrote:
One additional thing to watch is chain line / front mech. I used a SRAM GXP crankset, but because of the additional width of the chain stays on my mtb, the inner chain ring touched the stay. I changed to a Truvativ triple crankset, with the granny ring removed, but that moved the chain line too far out for the road front mech to work properly, so in the end I have compact road rings on a mtb crankset, a road rear mech and mtb front mech. It all works fine, but it really is a bit Frankenbike.



One nice point to note is that the new-ish Shimano "Compact" road crank size is exactly the same as the older ATB (non compact) MTB crank size. So you can dig out your old 110mm BCD chainsets and run these with proper retro front mechs and BB's. Then chain line isnt such an issue.


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PostPosted: Tue Aug 20, 2013 2:41 pm 
Dirt Disciple
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Joined: Mon Jun 10, 2013 1:24 am
Posts: 18
Here is my Ibis 700c conversion. CX fork in front and 26" to 700c canti bracket in rear. Tires are 700c x 40 but with skinnier road bike tires you should be able to almost match the circumference of your knobbies.

Image


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PostPosted: Tue Aug 20, 2013 6:00 pm 
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Joined: Tue Jun 04, 2013 11:52 am
Posts: 149
mark45acp wrote:
Here is my Klein Attitude with 700c - Fixie or SS - cyclo cross tyres - Onza brakes modified with longer bars on the cantilevers to reach the wheel - simple mod !


Looks nice. Any tyre/crown interface issues? Doesn't look like the forks would have to compress too far before there would be...


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